Even after Camio reveals himself, William remains concerned only with his grades and tuition and tries to distance himself from the demons and their political war.  Unfortunately, he soon finds himself roped into another problem when the Headmaster asks him to find the source of a mysterious singing voice that's been disturbing students late at night.
visual or auditory hallucinations caused by 
electromagnetic waves of high or low frequencies.
productos de la imaginación creados 
por ondas electromagnéticas
productos de la imaginación creados 
por ondas electromagnéticas
alucinações visuais ou auditivas causadas por ondas
 eletromagnéticas de alta ou baixa frequências.